Composition for forming layer, fluorescent lamp using the composition, and method of manufacturing a fluorescent lamp

Abstract

A slurry composition for forming a layer is provided. The slurry composition includes 100 parts by weight of a metal oxide selected from the group consisting of MgO, CaO, SrO, BaO, ZrO3, and a combination thereof; 1-200 parts by weight of a binding agent per 100 parts by weight of the metal oxide, the binding agent being selected from the group consisting of calcium phosphate (CaP), a calcium-barium-boron-based (CBB-based) oxide, a triple carbonate ((Ca, Ba, Sr)CO3), and a combination thereof; 1-10 parts by weight of a binder per 100 parts by weight of the metal oxide, the binder being selected from the group consisting of nitro cellulose, ethyl cellulose, methyl methacrylate, and a combination thereof; and 50-500 parts by weight of a solvent per 100 parts by weight of the metal oxide.

Description

BRIEF DESCRIPTION OF THE DRAWING

A more complete appreciation of the invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings.

FIG. 1 is a longitudinal sectional view of an EEFL according to an exemplary embodiment of the present invention;

FIG. 2 is a longitudinal sectional view of an EEFL according to another exemplary embodiment of the present invention;

FIG. 3 is a current-voltage graph of an EEFL of Example 4 and an EEFL of Comparative Example 1; and

FIG. 4 is a power-luminance graph of the EEFL of Example 4 and the EEFL of Comparative Example 1.

Claims

1. A slurry composition comprising: 100 parts by weight of a metal oxide selected from the group consisting of MgO, CaO, srO, BaO, ZrO3, and a combination thereof;1-200 parts by weight of a binding agent per 100 parts by weight of the metal oxide, the binding agent being selected from the group consisting of calcium phosphate (CaP), a calcium-barium-boron-based (CBB-based) oxide, a triple carbonate ((Ca, Ba, Sr)CO3), and a combination thereof;1-10 parts by weight of a binder per 100 parts by weight of the metal oxide, the binder being selected from the group consisting of nitro cellulose, ethyl cellulose, methyl methacrylate, and a combination thereof; and50-500 parts by weight of solvent per 100 parts by weight of the metal oxide.

2. The slurry composition of claim 1, wherein the solvent is selected from the group consisting of water, C1-C5 lower alcohol, C1-C5 alkyl acetate, C1-C4 alkyl cello solve, xylene, toluene, and a combination thereof.

3. The slurry composition of claim 1, further comprising one or more materials selected from the group consisting of a mercury abatement inhibitor and a dark property enhancer.

4. The slurry composition of claim 3, wherein the mercury abatement inhibitor is selected from the group consisting of Y303, Ce02, Ah03, and a combination thereof.

5. The slurry composition of claim 3, wherein the dark property enhancer

6. The slurry composition of claim 1, further comprising a fluorescent substance.

7. The slurry composition of claim 6, wherein a weight ratio of the metal oxide to the fluorescent substance is within a range of 1:100-100:1.

8. The slurry composition of claim 1, wherein the binder is included at 1-10 a parts by weight as the nitro cellulose per 100 parts by weight of the metal oxide; the binding agent is included at 1-50 parts by weight as a mixture including the calcium phosphate (CaP) and the calcium-barium-boron-based (CBB-based) oxide, which are mixed in a weight ratio of 1:1, per 100 parts by weight of the metal oxide; andthe solvent is included at 50-500 parts by weight as butyl acetate per 100 parts by weight of the metal oxide.

9. The slurry composition of claim 1, wherein the binder is included at I-I a parts by weight as the nitro cellulose per 100 parts by weight of the metal oxide; the binding agent is included at 1-200 parts by weight as the triple carbonate ((Ca, Ba, Sr)CO3) per 100 parts by weight of the metal oxide; andthe solvent is included at 50-500 parts by weight as butyl acetate per 100 parts by weight of the metal oxide.

10. The slurry composition of claim 6, wherein the binder is included at 1-10 parts by weight of the nitro cellulose per 100 parts by weight of the metal oxide; the fluorescent substance is included at 1-500 parts per 100 parts by weight of the metal oxide;the binding agent is included at 1-200 parts by weight as the triple carbonate ((Ca, Ba, Sr)CO3) per 100 parts by weight of the metal oxide; andthe solvent is included at 50-500 parts by weight as butyl acetate.

11. A method for manufacturing a fluorescent lamp, comprising the steps if: forming a coating layer of a fluorescent slurry composition on a glass tube; removing regions of the coating layer that correspond to external electrodes that will be formed in a succeeding process;wet-coating a composition comprising a metal oxide, a binding agent, a binder, and a solvent on the region;forming phosphor and metal oxide layers simultaneously by baking the glass tube;exhausting air out of the glass tube and sealing the glass tube after injecting a discharge gas into the glass tube; and,forming external electrodes at opposite ends of the glass tube.

12. A method for manufacturing a fluorescent lamp, comprising the steps of: wet-coating a composition comprising a metal oxide, a binding agent, a binder, a solvent, and a fluorescent substance on a glass tube;forming a phosphor layer containing the metal oxide by baking the glass tube;exhausting air out of the glass tube and sealing the glass tube after injecting a discharge gas in the glass tube; and,forming external electrodes at opposite ends of the glass tube.

13. The method of claim 11, wherein the type of glass tube may be selected from the group consisting of a straight cylindrical type, a bulb type, and a flat tube type.

14. The method claim 11, wherein the wet-coating is conducted by a method selected from the group consisting of dip coating, roll coating, blade coating, slit coating, and spray coating.

15. The method of claim 11, wherein the baking is conducted at a temperature within a range of 350-600° C.

16. A fluorescent lamp manufactured by the method of claim 11.

17. A fluorescent lamp manufactured by the method claim 12.

18. The fluorescent lamp of claim 16, wherein the fluorescent lamp may be an external electrode fluorescent lamp or a flat fluorescent lamp.